How long does it take for a medication to get out of your system? Specifically an antipsychotic?

I ask because it's been a while since I stopped taking it and nothing bad has happened. I feel like this Dx is WRONG, since something bad should happen if I go cold turkey off an AP.

Meds clearly don't do anything for me. And when I was asked questions that led to my "bipolar" diagnosis, I made random guesses when I answered the questions. "I dunno, but I think ..."